Remove include only fwl.h and IWYU.

xfa/src/fxfa/src/app/xfa_ffpushbutton.h

Index: xfa/src/fxfa/src/app/xfa_ffpushbutton.h
diff --git a/xfa/src/fxfa/src/app/xfa_ffpushbutton.h b/xfa/src/fxfa/src/app/xfa_ffpushbutton.h
index e3761d142f6d107a9ce6e297daa00ec8a0b2bc64..9e5d768265543f645981660b358d9d1447e7869e 100644
--- a/xfa/src/fxfa/src/app/xfa_ffpushbutton.h
+++ b/xfa/src/fxfa/src/app/xfa_ffpushbutton.h
@@ -7,10 +7,13 @@
 #ifndef XFA_SRC_FXFA_SRC_APP_XFA_FFPUSHBUTTON_H_
 #define XFA_SRC_FXFA_SRC_APP_XFA_FFPUSHBUTTON_H_
 
+#include "xfa/src/fxfa/src/app/xfa_fffield.h"
+
 #define XFA_FWL_PSBSTYLEEXT_HiliteNone (0L << 0)
 #define XFA_FWL_PSBSTYLEEXT_HiliteInverted (1L << 0)
 #define XFA_FWL_PSBSTYLEEXT_HilitePush (2L << 0)
 #define XFA_FWL_PSBSTYLEEXT_HiliteOutLine (4L << 0)
+
 class CXFA_FFPushButton : public CXFA_FFField {
  public:
   CXFA_FFPushButton(CXFA_FFPageView* pPageView, CXFA_WidgetAcc* pDataAcc);